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Mu-Tron Beigel Sound Lab Mu-FX Tru-Tron 3X

Mu-Tron Beigel Sound Lab Mu-FX Tru-Tron 3X

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Page last updated Aug 10, 2025

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Introducing the Mu-Tron Beigel Sound Lab Mu-FX Tru-Tron 3X, a premier filter effects pedal that brings vintage vibes to the modern guitarist's toolkit. This pedal is inspired by the legendary Mu-Tron III, known for its iconic auto-wah and envelope filter sounds that have shaped countless classic tracks. The Tru-Tron 3X revives this legacy with authentic analog circuitry, ensuring that every nuance of your playing is captured with clarity and warmth.

With its dynamic envelope control, the Tru-Tron 3X offers a versatile range of tones—perfect for funk, rock, or any genre that demands expressive sound shaping. Its intuitive controls allow you to adjust the filter sweep, range, and peak, giving you the freedom to tailor your sound precisely to your liking. Whether you're aiming for subtle texture or dramatic modulation, this pedal delivers with exceptional reliability and musicality.

Designed for both studio and stage, the Tru-Tron 3X features a rugged construction that can withstand the rigors of regular gigging. The true bypass switching ensures your tone remains pure when the pedal is not engaged, making it an indispensable part of any pedalboard setup.

Key Features:

Authentic analog circuitry for vintage sound
Dynamic envelope control for versatile tone shaping
Intuitive control layout with adjustable filter sweep, range, and peak
Rugged construction ideal for live performances
True bypass switching for pure signal integrity

Owner's manual

Mu-Tron Beigel Sound Lab Mu-FX Tru-Tron 3X User Manual

Product specs

Analog/Digital	analog
Power	12V, AC
Bypass	true bypass

Videos

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Premier Guitar

Review Demo - Beigel Sound Lab/Mu-FX Tru-Tron Envelope Filter

Premier Guitar

Beigel Sound Lab Mu-FX TruTron 3x BEST funk envelope controlled filter EVER !

gearmanndude

MU-FX / Tru-Tron 3X【デジマート製品動画】

digimartnet

Beigel Sound Lab - Mu-FX - Tru-Tron 3X

Dennis Kayzer

Mu-FX Tru-Tron 3X™ Envelope Filter Guitar Bass Effects Pedal Demo

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Critic Reviews

Beigel Sound Lab/Mu-FX Tru-Tron 3X Review - Premier Guitar

premierguitar.com

The Mu-Tron Beigel Sound Lab Mu-FX Tru-Tron 3X is a powerful update to the classic Mu-Tron III, capturing its rich expressiveness while expanding its potential. With authentic tones and independent filter gain, it excels in transforming simple melodies into vibrant, dynamic expressions. The build quality is excellent, though the industrial design lacks the original's charm. While its controls can be non-intuitive, patient tinkerers will find it rewarding. Not for everyone, but a treasure for those exploring beyond obvious applications.

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Bootsy Collins

Singer, Bassist

Funkadelic

Verified via Photo

Featured in this May 21, 2014 Bass Musician article.

“If you loved the original ‘Mutron’, then you are going to really love funkin’ with the all new ‘Tru-Tron 3X’,” says Bootsy Collins.

Stevie Wonder

Singer, Drummer

U.S.A. for Africa

Verified via Pedal of the Day

“[A] special Tru-Tron adapted to [Wonder’s] special needs and special talent” is mentioned by Mike Biegel of Mu-Tron in this February 15, 2017 Pedal of the Day interview.

By the time Musitronics was in full swing I met quite a few Jazz and Rock & Roll stars, and learned from them what they wanted in their “musical toys”. Among those were Stevie Wonder, whose song ‘Higher Ground’ put Musitronics “on the map”, and who now uses a special Tru-Tron adapted to his special needs and special talent.

Trey Anastasio

Guitarist

Phish

Verified via Photo

According to this February 2020 post on the fansite Trey's Guitar Rig, Anastasio used two Tru-Tron 3X units live between 2015 and early 2018.

Trey first added the Tru-Tron 3x to his rig for the 2015 Fare The Well shows with the “Core Four” surviving members of the Grateful Dead — a necessity given Jerry Garcia’s association with the pedal. To the delight of many fans, the pedal stuck around when Trey brought out his rig for ensuing Phish tours, before disappearing in Summer 2017. It briefly re-appeared for the last show of TAB Fall 2017 tour, and was back in the rig by New Year’s.

Trey’s Mu-Tron sound has a unique growl to it, a bit more Zappa than Garcia. Listen to a sample and read more in the thread below:

https://twitter.com/TreysGuitarRig/status/940837073510166529?ref_src=twsrc%5Etfw

Note: Trey has several of these pedals, one of which is branded as “Tru Tron” while another is branded with the original “Mu Tron.” Apparently the new company had an intellectual property issue in getting the rights to the original name for US production so that name was only used for European models.

For some time, Trey has been using 2 envelope filters. For awhile, one was for the classic sweep down (“wahaw” sound) and the other for the sweep up (“ahwah” sound). Later, when he started using more single coil settings, Trey set both filters to sweep down, but used different sensitivity settings so that one would be sensitive enough to be triggered by the lower-output single coil pickups.